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Just Replace
Just Replace – complete replacement of the old plywood or OSB when installing TPO/PVC, or as part of a coating system (when the project involves applying a new membrane or coating to the entire roof).
Removal
- Before starting work, remove all components installed on the plywood sheet as well as any membrane laid over it.
- Partial membrane removal for plywood replacement.
Full sheet removal: Unscrew all perimeter screws holding the sheet. Gently pry the plywood from underneath and lift it up around the edges.
- Partial plywood removal (damaged area):
Place a new sheet over the damaged section and trace its outline with a marker. Use a circular saw to carefully cut along the traced lines.
Use a multitool for cutting corners.
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Set the circular saw depth to match the thickness of the existing plywood to avoid cutting wires or damaging the roof structure
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Roof Interior Inspection
- Check the internal roof structure. Inspect the framing for rot or cracks — major repairs may be needed.
Preparation
- Sheet cutting: When replacing a full sheet, measure the needed size, cut the plywood to fit, and mark out any openings in advance.
- Framing layout: On the face of the plywood sheet, mark where the roof framing is located to make screw placement easier during installation.